Furnace door arch



April 1940' L. v. JOHNSON 97,696

' FURNACE DOOR ARCH Filed Dec. 14, 1938 JI-L I0 o I F|E-1- g Patented Apr. 16, 1940 FURNACE DOOR ARCH Leonard V. Johnson, McKeesport, Pa., assignor to National Tube Company, a corporation of New Jersey Application December 14, 1938, Serial No. 245,798

8 Claims. (01. 110-181) This invention relates to a furnace door arch and more particularly toan improved door arch for use on metallurgical furnaces and the like. Various types of vertically disposed door arches for metallurgical furnaces have been suggested and used. Some of these have been satisfactory while others have been entirely unsatisfactory, in that they would have to be replaced frequently or would necessitate frequent repairs from time to time, due tothe burning away of certain parts thereof. Such door arches usually consisted of a metal frame having a metallic bottom. flange for the purpose of supporting a refractory inner lining, usually brick, therein. As is well known in the art, the lower portion of the door arch is usually subjected to a more intense heat in its use than are the other portions thereof, and the bottom metallic supporting flange of such door arches would, after a short time, burn away or liningfalling therefrom as there was then no support therefor, thereby rendering such door arches unfit for further use. They then, of course, had either to be repaired before they could be further used or replaced by new door arches, which was expensive as well as inconvenient.

According to the present invention, there is provided an arch which is simple and inexpensive in its construction, and one in which the above disadvantages are eliminated in that the metallic bottom has been eliminated from the construction thereof. I

It is one of the objects of the present invention to provide an improved door arch for metallurgical furnaces which has a lower edge constructed of a refractory material.

It is another object of this invention to provide an improved door arch for metallurgical furnaces in which the means for supporting the refractory door arch.

It is still another object of this invention to In the accompanying drawing there is shown,

for the purpose of illustration, one embodiment and a modification thereof which my. invention i may assume in practice. In the drawing:

. vention;

warp, which, of course, resulted in the refractory lining thereof is spaced from the bottom of the Figure 1 is a rear elevation of the improved furnace door arch of my invention; Figure 2 is a section taken on line II-II'of Fi urel;

Figure 3 is a perspective of one of the .refracjtory bricks used in connection with my in- Figure 4 is a perspective showingthe construction of the corner of the improved door arch of my invention with the refractory lining removed;

Figure 5 is a section similar to that shown'in Figure 2 showing a modified form of a refractory brick that may be used; and,

Figure 6 is a view similar to Figure 1 showing a modified construction of the'improvcd furnace door arch of my invention. HReferring more particularly to the drawing, the improved furnace door arch of my invention. which, it will be understood, is adapted to be vertically arranged over the charging opening of metallurgical furnaces, comprises a metallic frameor housing 2 having-means, such as aperturedangle iron members 3, securely mounted on the top thereof for removably supporting the door arch above the charging opening of the furnace. The metallic frame 2 is preferably formed by the welding together of a plurality of metallic plates but it will be understood that the frame may be made of cast iron or of any other suitable material. 7

The metallic: frame adapted for use in the present invention comprises an outer or front plate 4 having a metallic: plate 5 positioned along the top inner edge of the plate, and plates 6 positioned along the inner edges thereof. There is positioned along the lower inner edge of plate 4, at each end thereof, plates 1 which extend from the plates 6 and terminate intermediate the length of the plate 4 so as to provide asubstantial opening 8 therebetween in the bottom of the frame. These plates act to'se'at the door arch on door jambs of the "furnace. There is also positioned on the inner wall of the plate 4 a plurality of spaced-apart vertically'arranged plates 9 which extend from the botto-m'side of the upper plate 5 to a point intermediate the top and bottom of the plate 4. All of these plates are preferably welded to the plate 4 and arranged perpendicularly thereto so as to provide a hous ing for a refractory inner lining It. 7

There is also arranged on the inner wall of plate 4, and preferably welded thereto, at a position spaced from the bottom edge of the plate 4 opposite the opening 8 in the bottom of the frame,1a plurality of spaced-apart outwardly, ex-

tending aligned bars or members 12, of any suitable shape, which are preferably inclined upwardly at approximately an angle of seven degrees. These bars I2 are preferably spaced apart approximately a distance equal to the thickness of two bricks, as shown in Figure 1. There is provided a suitable number of refractory bricks [3 which are adapted to form at least a portion of the lowermost row of the brick lining. Each of these bricks has an angularly positioned groove l4 arranged in one face thereof, as shown in Figure 3 of the drawing, with the groove in one -half the number of bricks formed on one face thereof and with the groove in the other half thereof formed on the opposite face thereof.

If desired, however, the bars l 2 could be spaced a distance apart equal to the thickness of one brick, as shown in Figure 6. In such a case, each of the bricks l3 would have a similar angular groove l5 arranged in each face thereof. The bricks it are vertically arranged so that the angular grooves M therein of any two of the bricks are oppositely disposed and positioned around the outwardly extending bars i2 so as to encompass the same, as shown in Figure 1. It will be understood that the grooves it in the bricks and the bars It are so arranged relative to the bottom edge of the plate 4 that a portion of the bottom of the bricks will extend below the lower edge of the plate 4 through the opening 8 in the bottom of the frame when they are arranged therein against the plate 4. There is arranged above the lowermost row of vertically arranged bricks I3 a plurality of rows of similar refractory bricks M which are preferably arranged flatwise so as to fill the remainder of the area above the bricks l3 and at the sides thereof; the bricks at each end of the lowermost row of vertically arranged bricks 13, of course, being supported by the bottom side plates 7.

It will be seen that, with the bars positioned at an angle with the horizontal and with the grooves M in the bricks 13, being positioned angularly to correspond therewith, these bricks will always tend to be positioned against the inner wall of the plate 4 due to the weight thereof, thereby tending to keep them positioned in the frame rather than to fall therefrom. It is the purpose of the vertically arranged plates 9 positioned in the upper portion of the frame to tend to retain the fiatwise arranged bricks in this upper portion against the inner face of the plate 6, thereby eliminating any danger of them falling therefrom. If desired, the outer ends of the grooves It in the bricks l3, after they are assembled on the bars l2, may be filled with cement or other suitable refractory material so as to keep the heat from reaching the ends of the bars I2, as shown in Figure 2, or the grooves M may terminate intermediate the width of the bricks, as shown in Figure 5, thereby eliminating the necessity of filling the ends thereof.

As a result of my invention, it will be seen that there is provided an improved door arch for metallurgical furnaces in which the refractory brick lining extends below the metallic frame or housing of the door thereby providing a door arch having a bottom construction which will repel the intense heat to which it is subjected.

While I have shown and described one embodiment and a modification thereof of my invention, it will be understood that these embodiments are merely for the purpose of illustration and description and that various other forms maybe devised within the scope of my invention, as defined in the appended claims.

I claim:

1. A furnace door arch of the class described comprising a metallic frame having a refractory inner lining consisting of a plurality of rows of bricks with at least a portion of the bricks in the lowermost row thereof extending below the lower edge of the frame, and means carried by said frame for holding the bricks therein.

2. A furnace door arch of the class described comprising a metallic frame having a refractory inner lining consisting of a plurality of rows of bricks with the bricks in the upper rows thereof arranged 'flatwise and with at least a portion of the bricks in the lowermost row thereof arranged vertically and extending beyond the lower part of the frame, and means carried by said frame for holding said bricks therein.

3. A furnace door arch of-the class described comprising'an open back metallic frame for housing a refractory inner lining consisting of a plurality of rows ofbricks with the bricks in the upper rows thereof arranged fiatwise and with at least a portion of the bricks in the lowermost row thereof arranged vertically and extending through an opening in the bottom of said frame, and means for holding the bricks therein.

4. A furnace door arch of the class described comprising a metallic frame having a refractory inner lining consisting of a' plurality of rows of bricks with the bricks in the upper rows thereof arranged fiatwise and with at least a portion of the bricks in the lowermost row thereof arranged vertically and extending beyond the lower edge of the frame, and brick supporting means arranged on said frame, said supporting means adapted to cooperate with grooves formed in the bricks of the vertically arranged lowermost row for supporting the same therein.

5. A furnace door arch of the class described as defined in claim 4 wherein the means arranged on the frame for supporting the bricks of the lowermost rowconsists of a plurality of spacedapart outwardly extending bars which are inclined upwardly and adapted to lie in angular grooves arranged in the faces of the vertically arranged bricks of said row.

6. A furnace door arch of the class described as defined in claim 4 wherein the means. carried by the frame for supporting the bricks therein con sists of a plurality of spaced-apart members which are adapted to extend between the vertically arranged bricks of the lowermost row and cooperate with oppositely disposed grooves arranged in at least one of the opposed faces of each of said bricks in said row to support the same.

'7. A. furnace door arch of the class described as defined in claim 4 wherein the means for supporting the vertically arranged bricks of the lowermost row consists of a plurality of spacedapart aligned members extending outwardly from the frame and inclined upwardly at an angle to the horizontal, said inclined members spaced apart approximately a distance equal to the'thickness of two bricks and adapted to extend between the vertically arranged bricks of said lowermost row to cooperate with oppositely disposedangularly arranged grooves in the faces of opposed bricks opposite said inclined members whereby the bricks will, tend to stay in engagement with said members due to the inclination thereof to support the same.

8. A furnace door arch of the class described comprising a metallic frame having a refractory lining consisting of a plurality of rows of bricks,

. with at least the central portion of the lowermost row thereof arranged vertically and extending beyond the lower edge of said frame with the remainder of the rows of bricks arranged flatwise,

a plurality of spaced-apart members carried by v said frame which are adapted to cooperate with supporting the remaining bricks of said lower- 5 most row and in turn the bricks thereabove.

LEONARD v. JOHNSON. 

